Electromagnet



March 18 1924.

- E. B. THURSTON ELECTROMAGNET Filed Feb. 14 1919 2 Sheets-Sheet 1 FIG. E

gnuewfo'c March 18, 1924. 1,486,938

E. B. THURSTON ELECTROMAGN-ET Filed Feb. 14 1919 2 Sheejns-Sheet 2 1 FIE-5 FIE). a

Patented Mar. 18, 1924.

UNITED STATES,

PATENT OFFICE.

ERNEST B. THURSTON, OF TOLEDO, OHIO, ASSIGNOR TO THE HAUGHTON ELEVATOR &; MACHINE COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

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Application filed February 14, 1919. Serial No. 277,043.

To all whom it may concern:

Be it known that I, ERNEST B. THURSTON, a citizen of the United States of America, residing at Toledo, Lucas County, Ohio, have invented new and useful Electromagnets, of which the following is a specification.

This invention relates to electromagnets, and more particularly to features of mechanical construction therein.

This invention has utility, especially when incorporated'in pivoted jaw member magnets where considerable impact force occurs, as in electromagnetic brakes for hoistin drums. e I

eferring to the drawings Fig. 1 is a side elevation of an embodiment of the invention in a hoisting drum for electric elevators;

F i 2 is an enlarged end view of tlie doub e jaw members of the electromagnet of Fig. 1;

Fig. 3 is a plan view of the electromagnet of Fig. 2; I

Fig. 4 is a section on the line IV-IV, Fig. 2;

Fig.5 is a view similar'to Fig.2 of a double-jaw magnet in which the magnet opening means ispivotedbelowthe normal ma net mounting; f

*ig. 6 is a section on the line VL-VI of Fig. 5;

Fig. 7 is a view of a single movable jaw member electromagnet; and Fig. 8 is a section on the line VIII- VIII,

I The brake drum 1 is shown .as having coacting therewith the opposing brake shoes 2 controlled by the levers 3, 4, links 5, and the jaw members 6 carried by bearing pins- 7 loosely mounted in frame 8 embracing the drum 1. The spring 9 tends normally to throw the jaw members 6 in spaced or open position. ported by the bearing pin 7 engaging the frame 8. i V

The frame 8 is shown as having bearing openings 10 therein larger than the pin 7, and adjacent these bearin openings 10 each memberfi has a face 11. 'ilore remote from the bearing pin 7 than the coacting faces These members 6 are then sup- 11, there arethe opposing faces 12 of the magnetlc circuit carrying laminations 13 adjacent the energizing 'coill l of the electromagnet. In the'multiple magnetic face jaw electromagnet, as shown in Fig. 1, there are besides the abutting faces 12 of the electromagnetic circuit, additional intermediate air gap providing faces 15 shown in Figs. 3 and 4:. The upstanding pivoted jaw members 16 of. the electromagnet of Fig. 5 are shown as having downward extensions 17 to which the members 18 to be actuated are connected.

In the sin le movable jaw member structure of Fig. the fixed member 19 is shown as having fast therein the aligned pivot pins 20 upon which the movable jaw member 21 is loosely mounted to carry its magnetic circuit portion 22. A spring 23, be tween the members 19 and 21, serves to throw the member or portion 22 away from the laminated portion of the electro-magnet of the member 19, when the magnet coil is not energized. V

With the electro-magnetic coil de-energized, the jaw members are thrown open and the load thereof is normally carried in the loose bearings of the supporting member by allowing the pin 7 to rest down therein. Upon energizing of the coil, the spring 9 is overcome and the electromagnetic circuit in the jaw members tends to draw the magnetic facesinto quick impacting position. As the members move up to such position, the opposing faces 11 coact or wedge to shift slightly the members 6 in the, bearingsand the force of the impact of the jaw members is thus not transmitted to the supporting structure, but is dissipated between the jaw members.

For efiiciency in operation, and upkeep, it is essential that the coacting magnetic faces bemaintained in true condition for full face contact with no roughened or battered portions. As herein directed by the coaoting faces 11, this true condition is maintained, for there is no tendency to wear off one magnetic contact edge to cause the excess heating, as would occur if the faces would strike at one portion before another, and wear down. The full face contact occurring at each impact any wean ing is uniform over the face. This looseness of mounting has a further face manufacturing advantage in the cheapness of manufacturing, for the bearing need not be accurate and the only dressing occurs as to the coplanar faces 11 and 12, and this may readily be done by blocking the parts down for dressing upon a machine tool. For this true contacting of the magnetic faces, it is desirable that the coacting faces as well. as the magnetic faces shall be in a plane perpendicular to the line of travel of the movable magnetic circuit member at its contact point.

\Vhat is claimed and it is desired to secure by Letters Patent is:

1. An electromagnetic brake including a coil, and magnetic circuit providing means embodying a member including laminations energized by the coil to be rockably actuated, and a loose bearing for sustaining the member, said member being provided with a portion spaced from the laminations effective, as the member is rocked by the energized coil, to give the member an additional movement on its bearing.

2. An electromagnetic brake including a coil, and magnetic circuit providing means embodying a member including laminations energized by the coil to be rockably actuated, and a loose pivot bearing for the member, said member being provided with a portion independent of the laminations effective, as the member is rocked by the energized coil, to give the member an additional movement on its bearing.

3. An electromagnetic brake including a coil, and magnetic circuit providing means embodying a rockable member, said member having a plane surface providing a con tacting face, and an abutment independent of the magnetic circuit in the same plane as said face and spaced from said face, and opposing means coacting with the face and abutment.

4:. An energizing coil, and a pair of members, one of which is to be moved toward the other upon energizing the coil, said mem bers having magnetic circuit portions adjacent the coil, and said members also having spaced from said magnetic portions opposing engaging relatively tilted seats coacting on energizing the coil to more fully impact each other as the magnetic circuit portions approach sealing position.

An energizing coil, a pair of members, one of which is a rocker member, lamination means providing a ma netic portion for one of said members, there being means normally rocking said rocker member withdrawn from the other member, and a bearing supporting the withdrawn member, said members having seats away from the lamination means coacting to shift the withdrawn member as to its hearing as the energizing of the coil acts upon the lamination means to cause the members to approach.

6. An energizing coil, a pair of members, one of which is a rocker member, there being means normally rocking said rocker member withdrawn from the other member, and a bearing supporting the rocker member in withdrawn position, said members having seats away from being energized directly by the coil coacting to shift the rocker member as to its bearing as the energizing of the coil moves the rocker member toward the opposing member.

7. An energizing coil, a pair of members one of which is a rocker member, said members having relatively movable opposing faces as a break in a magnetic circuit energized by the coil, there being means normally rocking said rocker member to maintain the break between the magnetic circuit faces of the members, and a bearing supporting the rocker member in withdrawn position, said members having additional faces coacting to shift the rocker member as to its hearing as the energizing coil magnetizes the members to move the rocker member toward the other member, the final travel direction of the rocker member being perpendicular to the final position of the coacting additional faces.

8. An energizing coil, a pair of members one of which is a rocker member, said members having opposing faces as a break in a magnetic circuit energized by the coil and additional coact-ing faces, and a bearing nearer the coacting faces than the magnetic circuit breaking faces, said bearing supporting the rocker member in withdrawn position, the two faces of the rocker member lying in a. common plane.

9. An electromagnet including a pair of magnetic circuit jaws having bearings from which said jaws have common spacing, and fixed mounting bearings loosely carrying the jaw bearings to place the jaws in opposing relation, said magnetic circuit jaws coacting one with the other to limit shifting of the respective bearings toward each other.

10. An electromagnet including a jaw having a contact face, a loose mounting for the jaw, and mechanical means for shifting the magnetized jaw as to its mounting for initial seating of the full contact face of the jaw.

11.. An electromagnet including apair of opposing multiple magnetic face jaw members, said members having additional wedge faces coplanar with the magnetic faces and coacting as the members travel to direct the magnetic faces.

12. An electromagnet including a pair of opposing upstanding multiple magnetic face jaw members, laterally spaced pivot bearings for the members as to which the members are loosely mounted,'and means northan the magnetic faces, whereby energizing mally acting to space the members with each of the members to overcome the normal spacmember sustained on its bearing, said meming means, rocks the members for-coacting 10 bers each having a face adjacent its bearing face action in shifting the members as to 5 coacting with the corresponding face of the their bearings.

. other member, said faces being vco-planar In witness whereof I afiix my signature. with the faces more remote from the bearing ERNEST B. THURSTON. 

